1261590571 has 2 divisors, whose sum is σ = 1261590572. Its totient is φ = 1261590570.

The previous prime is 1261590527. The next prime is 1261590607. The reversal of 1261590571 is 1750951621.

It is a strong prime.

It is an emirp because it is prime and its reverse (1750951621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261590571 - 2⁹ = 1261590059 is a prime.

It is a super-2 number, since 2×1261590571² = 3183221537672212082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1261590571.

It is not a weakly prime, because it can be changed into another prime (1261590521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630795285 + 630795286.

It is an arithmetic number, because the mean of its divisors is an integer number (630795286).

Almost surely, 2^1261590571 is an apocalyptic number.

1261590571 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261590571 is an equidigital number, since it uses as much as digits as its factorization.

1261590571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 37.

The square root of 1261590571 is about 35518.8762631928. The cubic root of 1261590571 is about 1080.5365906361.

The spelling of 1261590571 in words is "one billion, two hundred sixty-one million, five hundred ninety thousand, five hundred seventy-one".